Malicious PDF — malware analysis report

Static analysis result for SHA-256 2ac2a53d534239ee…

MALICIOUS

PDF

36.9 KB Created: 2020-08-14 10:14:04 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: f65e67bb7a9507c18d3004143cdcc724 SHA-1: 05db71bd59920e49d09ed1cf8656ee25026edf84 SHA-256: 2ac2a53d534239ee743fcab06971e5afde04644a96cf1ed96eb2b9a4c6e74dad
152 Risk Score

Malware Insights

MITRE ATT&CK
T1566.002 Spearphishing Attachment T1059.001 PowerShell

The PDF contains a mass external link farm, with many links pointing to Shopify domains and one critical link to a known malicious redirector at ttraff.ru. The ML classifier also strongly indicated maliciousness. The document body contains obfuscated text and a URL that is likely used for redirection or further payload delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 1.0000

Heuristics 4

  • PDF links to known malicious redirector infrastructure critical PDF_MALICIOUS_REDIRECTOR_LINK
    PDF contains a clickable URI to redirector infrastructure used by a known malicious PDF SEO/adware delivery campaign. These documents typically rely on user interaction and redirect chains rather than a PDF parser vulnerability.
  • Small PDF contains mass external PDF link farm critical PDF_SEO_LINK_FARM
    Small PDF contains many clickable external PDF links, mostly clustered on one host. This matches generated SEO/link-farm PDF carriers used to route users into malicious or unwanted-software delivery chains, rather than a normal document citation pattern.
  • Object number defined twice with different bodies info PDF_DUPLICATE_OBJ_BODY_INCREMENTAL
    The same indirect object (N G) is defined more than once with different body bytes. First-wins and last-wins readers will resolve different content, which is a parser-confusion shape used by targeted PDFs. Body-only differences are common in benign incremental updates, so severity is raised only when the duplicate carries active content.
  • Embedded URL info EMBEDDED_URL
    One or more URLs were extracted from the document. The URL itself is not a detection — see the per-URL labels for which channel (macro, JS, link annotation, document body, ...) reached each URL.
    URL https://ttraff.ru/pify?keyword=mc+caverinha+tipo+gta
    • http://files.brijaemorris.com/uploads/1/3/0/9/130969454/9857086.pdf
    • http://files.merrifieldseminar.com/uploads/1/3/2/7/132710655/7749287.pdf
    • http://files.thespringschurch.net/uploads/1/3/1/6/131606165/1729119.pdf
    • https://cdn.shopify.com/s/files/1/0428/9835/8432/files/99231100330.pdf
    • https://cdn.shopify.com/s/files/1/0430/0954/0257/files/misplaced_modifiers_examples_and_corrections.pdf
    • https://cdn.shopify.com/s/files/1/0431/3877/7249/files/nupirupipolujunexajasone.pdf
    • https://cdn.shopify.com/s/files/1/0433/9643/2021/files/81633630816.pdf
    • https://cdn.shopify.com/s/files/1/0436/9724/2262/files/dmrc_metro_map_download.pdf
    • https://cdn.shopify.com/s/files/1/0430/6527/8625/files/adventure_aquarium_map.pdf
    • https://cdn.shopify.com/s/files/1/0429/3469/8147/files/albert_camus_the_fall_download.pdf
    • https://cdn.shopify.com/s/files/1/0436/9494/8517/files/31390845929.pdf
    • https://cdn.shopify.com/s/files/1/0433/8447/1719/files/applied_partial_differential_equations_haberman_5th.pdf
    • https://cdn.shopify.com/s/files/1/0427/9202/6271/files/llc_operating_agreement_template_texas.pdf
    • https://cdn.shopify.com/s/files/1/0431/9058/3464/files/91813035396.pdf
    • https://cdn.shopify.com/s/files/1/0430/7373/2768/files/koxisol.pdf
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00005423.bin
8ba69d7aece72c70da6f73ce072e0ed8dc4c6a9ac8ae49366daaa7d2ee2cd412
pdf-font-stream PDF embedded font (sfnt) at offset 0x5423 5048 bytes
font_01_sfnt_off00006556.bin
4f22882f992fc220fd47ca1ddc01af1bd8f6cc3c0abaea338bb48fa5b384f6ae
pdf-font-stream PDF embedded font (sfnt) at offset 0x6556 9908 bytes